Abstract
The side-chain hydroxylation of cholesterol by specific enzymes produces 24(S)-hydroxycholesterol, 25-hydroxycholesterol, 27-hydroxycholesterol, and other products. These enzymatically formed side-chain oxysterols act as intermediates in the biosynthesis of bile acids and serve as signaling molecules that regulate cholesterol homeostasis. Besides these intracellular functions, an imbalance in oxysterol homeostasis is implicated in pathophysiology. Furthermore, growing evidence reveals that oxysterols affect cell proliferation and cause cell death. This chapter provides an overview of the pathophysiological role of side-chain oxysterols in developing human diseases. We also summarize our understanding of the molecular mechanisms underlying the induction of various forms of cell death by side-chain oxysterols.
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We thank Ren Chiba for his support in making the figures.
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This work was supported in part by a JSPS KAKENHI Grant-in-Aid for Scientific Research (C) 16K08254, 19K07093Â and 23K10902 to YU.
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Urano, Y., Noguchi, N. (2024). Enzymatically Formed Oxysterols and Cell Death. In: Lizard, G. (eds) Implication of Oxysterols and Phytosterols in Aging and Human Diseases. Advances in Experimental Medicine and Biology, vol 1440. Springer, Cham. https://doi.org/10.1007/978-3-031-43883-7_10
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